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Message ID: 255     Entry time: Sat Mar 26 01:49:48 2016
Author: Koji 
Type: Optics 
Category: Characterization 
Subject: HQEPD QE 

Calibration of the transimpedance

Use KEITHLEY 2450 as a calibrated current source. Model 2450 has the current source accuracy of 0.020%+1.5uA at 10mA range. For 6mA current output, the error is 3uA (0.05%).

The output of the current amp at 103 Ohm setting was 6.0023V when -6.000mA current was applied. i.e R_trans = 1000.4 +/- 0.5 Ohm. This is a negligible level.

QE of the diodes (As of 07/30/2016)

Refer E1800372

Attachment 1: QE1.png  65 kB  Uploaded Sat Mar 26 13:35:27 2016  | Hide | Hide all | Show all
Attachment 2: QE2.png  60 kB  Uploaded Sat Mar 26 13:35:27 2016  | Show | Hide all | Show all
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